US6113104A - Sealing device - Google Patents

Sealing device Download PDF

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Publication number
US6113104A
US6113104A US08/981,209 US98120997A US6113104A US 6113104 A US6113104 A US 6113104A US 98120997 A US98120997 A US 98120997A US 6113104 A US6113104 A US 6113104A
Authority
US
United States
Prior art keywords
casing
seal
shaft
housing
sealing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/981,209
Inventor
Kjell Forslund
Anders Bergdahl
Klas Kristrom
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet AB
Original Assignee
Valmet Fibertech AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Fibertech AB filed Critical Valmet Fibertech AB
Assigned to SUNDS DEFIBRATOR INDUSTRIES AB reassignment SUNDS DEFIBRATOR INDUSTRIES AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BERGDAHL, ANDERS, FORSLUND, KJELL, KRISTROM, KLAS
Assigned to VALMET FIBERTECH AKTIEBOLAG reassignment VALMET FIBERTECH AKTIEBOLAG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SUNDS DEFIBRATOR INDUSTRIES AKTIEBOLAG
Application granted granted Critical
Publication of US6113104A publication Critical patent/US6113104A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils

Definitions

  • the present invention relates to a device for sealing a rotary shaft extending into a container, in which overpressure is maintained. More particularly, the present invention relates to such a device which can be used, for example, in a pressurized screen for the screening of pulp suspensions, in which case the container is the airtight housing of the pressurized screen.
  • a pressurized screen for the screening of pulp suspensions comprises an airtight housing, in which a screening member is located.
  • the housing has an inlet for the pulp suspension and outlets for accept and rejection portions, respectively.
  • the pulp suspension is caused to flow along the screening member, and the accept portion passes through the screening member, which can be rotary or stationary.
  • the rotor is located in the housing for generating the flow along the screening member.
  • the rotor of the rotary screening member in such devices is mounted on a shaft, which is driven by a motor located outside the housing.
  • the shaft is supported in bearings and extends into the housing.
  • the housing is pressurized and, therefore, a seal is provided where the shaft enters the housing.
  • an internal axial bearing is located in an airtight casing, which extends into the housing.
  • the seal is mounted in a seal holder between the casing and the interior of the housing inside the internal bearing.
  • the present invention has the object of eliminating the aforesaid problems.
  • the device according to the present invention therefore, renders it possible for the shaft seal side located outside the container, i.e. in the casing, to be made accessible during seal exchange in a simple manner.
  • apparatus for sealing a rotary shaft supported by bearings within an airtight casing and extending from the airtight casing into a housing maintained at an overpressure which comprises a mechanical shaft seal for sealing the shaft as it passes into the housing, seal mounting means mounted on the casing for mounting the mechanical shaft seal, the casing including at least one opening for providing access to the mechanical shaft seal within the casing, and a removable airtight cover for sealing the at least one opening in the casing during operation of the apparatus.
  • the mechanical shaft seal comprises a mechanical cartridge seal.
  • the apparatus includes O-ring means for sealing the removable cover to the casing.
  • the casing is mounted within a pressurized screen for the screening of a pulp suspension.
  • a pressurized screen for screening pulp suspensions comprises an airtight housing 10, in which a stationary screening member 11 is located.
  • the housing has an inlet 12 for the suspension and outlets 13 and 14 for accept and reject portions, respectively.
  • a rotor 15 is located outside the screening member 11 and is provided with pulsation means 16, which move along the screening member 11 in order to promote the screening process.
  • the rotor 15 is supported on a shaft 17, which is mounted in an upper (inner) bearing 18 and a lower (outer) bearing 19.
  • the shaft 17 extends into the housing 10 and is enclosed by an airtight casing 20 in which the bearings, 18 and 19, are located.
  • a mechanical seal 21 preferably a mechanical cartridge seal, which is mounted in a seal holder 22 attached to the casing 20.
  • the object of the seal 21 is to resist the overpressure in the housing 10 and prevent the pulp suspension from penetrating into the bearing space in the casing 20.
  • the casing is provided with openings 23.
  • the casing portion comprising the openings 23 preferably is detachably attached to the unbroken portion of the casing.
  • the openings 23 are closed by a detachable airtight cover 24, preferably in the form of a cylindrical sleeve.
  • the cover 24 is attached sealingly to the seal holder 22 and extends past the openings 23 so as to seal against the unbroken portion of the casing 20.
  • the seals of the cover 24 preferably are O-rings.
  • the gland 25 of the mechanical seal 21 is attached to the seal holder 22, and the seal portion rotating with the shaft is attached to the shaft.
  • the seal is both attached and dismounted by means of the openings 23, after the detachable cover 24 has been removed.
  • the housing 10 is opened and the rotor 15 is dismounted. Thereafter, the airtight cover 24 is removed, whereby the mechanical seal 21 is accessible through the openings 23 and can be removed from the shaft.
  • the transport protection for the seal can also be dismounted through the openings 23.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Sealing Devices (AREA)
  • Mechanical Sealing (AREA)
  • Glass Compositions (AREA)
  • Seal Device For Vehicle (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Gasket Seals (AREA)
  • Sealing Of Bearings (AREA)
  • Package Closures (AREA)

Abstract

Apparatus for sealing rotary shafts supported by bearings within an airtight casing and extending into a housing maintained at an overpressure is disclosed including a mechanical shaft seal for sealing the shaft as it passes into the housing, a seal mount mounted on the casing for mounting the mechanical shaft seal, the casing including an opening to provide access to the mechanical shaft seal within the casing, and a removable airtight cover for sealing the opening in the casing during operation of the apparatus.

Description

FIELD OF THE INVENTION
The present invention relates to a device for sealing a rotary shaft extending into a container, in which overpressure is maintained. More particularly, the present invention relates to such a device which can be used, for example, in a pressurized screen for the screening of pulp suspensions, in which case the container is the airtight housing of the pressurized screen.
BACKGROUND OF THE INVENTION
A pressurized screen for the screening of pulp suspensions comprises an airtight housing, in which a screening member is located. The housing has an inlet for the pulp suspension and outlets for accept and rejection portions, respectively. In order to promote the screening process, the pulp suspension is caused to flow along the screening member, and the accept portion passes through the screening member, which can be rotary or stationary. In the latter case, the rotor is located in the housing for generating the flow along the screening member.
The rotor of the rotary screening member in such devices is mounted on a shaft, which is driven by a motor located outside the housing. The shaft is supported in bearings and extends into the housing. The housing is pressurized and, therefore, a seal is provided where the shaft enters the housing. In order to provide stability for the shaft, an internal axial bearing is located in an airtight casing, which extends into the housing. The seal is mounted in a seal holder between the casing and the interior of the housing inside the internal bearing.
This structural design has the disadvantage that the external (atmospheric) side of the shaft seal is accessible only after the entire shaft with its bearings has been dismounted. This results in the fact that conventional shaft seals of the mechanical seal type, for example a so-called cartridge seal, cannot be applied. In many cases this is a considerable disadvantage, because it requires complicated structures and lengthy dismantling work at the time of seal exchange.
The present invention has the object of eliminating the aforesaid problems. The device according to the present invention, therefore, renders it possible for the shaft seal side located outside the container, i.e. in the casing, to be made accessible during seal exchange in a simple manner.
SUMMARY OF THE INVENTION
In accordance with the present invention, these and other objects have now been accomplished by the discovery of apparatus for sealing a rotary shaft supported by bearings within an airtight casing and extending from the airtight casing into a housing maintained at an overpressure, which comprises a mechanical shaft seal for sealing the shaft as it passes into the housing, seal mounting means mounted on the casing for mounting the mechanical shaft seal, the casing including at least one opening for providing access to the mechanical shaft seal within the casing, and a removable airtight cover for sealing the at least one opening in the casing during operation of the apparatus. Preferably, the mechanical shaft seal comprises a mechanical cartridge seal.
In accordance with a preferred embodiment of the apparatus of the present invention, the apparatus includes O-ring means for sealing the removable cover to the casing. In a preferred embodiment, the casing is mounted within a pressurized screen for the screening of a pulp suspension.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention may be more fully appreciated with reference to the following detailed description, which, in turn, refers to the drawing which is a side, elevational, partially sectional view of the apparatus of the present invention used in connection with a pressurized screen for the screening of a pulp suspension.
DETAILED DESCRIPTION
Referring to the drawings, a pressurized screen for screening pulp suspensions comprises an airtight housing 10, in which a stationary screening member 11 is located. The housing has an inlet 12 for the suspension and outlets 13 and 14 for accept and reject portions, respectively. A rotor 15 is located outside the screening member 11 and is provided with pulsation means 16, which move along the screening member 11 in order to promote the screening process. The rotor 15 is supported on a shaft 17, which is mounted in an upper (inner) bearing 18 and a lower (outer) bearing 19. The shaft 17 extends into the housing 10 and is enclosed by an airtight casing 20 in which the bearings, 18 and 19, are located. Above (inside of) the upper (inner) bearing 18, the passage of the shaft 17 into the housing 10 is sealed by a mechanical seal 21, preferably a mechanical cartridge seal, which is mounted in a seal holder 22 attached to the casing 20. The object of the seal 21 is to resist the overpressure in the housing 10 and prevent the pulp suspension from penetrating into the bearing space in the casing 20.
In order to render it possible to gain access to the side of the seal 21 located in the casing 20, the casing is provided with openings 23. The casing portion comprising the openings 23 preferably is detachably attached to the unbroken portion of the casing. During operation of the shaft the openings 23 are closed by a detachable airtight cover 24, preferably in the form of a cylindrical sleeve. The cover 24 is attached sealingly to the seal holder 22 and extends past the openings 23 so as to seal against the unbroken portion of the casing 20. The seals of the cover 24 preferably are O-rings.
The gland 25 of the mechanical seal 21 is attached to the seal holder 22, and the seal portion rotating with the shaft is attached to the shaft. The seal is both attached and dismounted by means of the openings 23, after the detachable cover 24 has been removed.
In order to exchange the mechanical seal 21, the housing 10 is opened and the rotor 15 is dismounted. Thereafter, the airtight cover 24 is removed, whereby the mechanical seal 21 is accessible through the openings 23 and can be removed from the shaft. The transport protection for the seal can also be dismounted through the openings 23.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims (4)

What is claimed is:
1. Apparatus for sealing a rotary shaft supported by bearings within an airtight casing and extending from said airtight casing into a housing maintained at an overpressure, said apparatus comprising a mechanical shaft seal for sealing said shaft as said shaft passes into said housing, seal mounting means mounted on said casing for mounting said mechanical shaft seal, said casing including at least one opening for providing access to said mechanical shaft seal within said casing so that said mechanical shaft seal can be removed from said shaft, and a removable air tight cover for sealing said at least one opening in said casing during operation of said apparatus.
2. The apparatus of claim 1 wherein said mechanical shaft seal comprises a mechanical cartridge seal.
3. The apparatus of claim 1 including means for sealing said removable cover to said casing.
4. The apparatus of claim 1 wherein said casing is mounted within a pressurized screen for screening of a pulp suspension.
US08/981,209 1995-07-03 1996-06-24 Sealing device Expired - Fee Related US6113104A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9502400A SE504657C2 (en) 1995-07-03 1995-07-03 sealing device
SE9502400 1995-07-03
PCT/SE1996/000821 WO1997002384A1 (en) 1995-07-03 1996-06-24 Sealing device

Publications (1)

Publication Number Publication Date
US6113104A true US6113104A (en) 2000-09-05

Family

ID=20398822

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/981,209 Expired - Fee Related US6113104A (en) 1995-07-03 1996-06-24 Sealing device

Country Status (15)

Country Link
US (1) US6113104A (en)
EP (1) EP0836658B1 (en)
JP (1) JP3787158B2 (en)
CN (1) CN1183818A (en)
AT (1) ATE200121T1 (en)
AU (1) AU691120B2 (en)
BR (1) BR9609583A (en)
CA (1) CA2220298A1 (en)
DE (1) DE69612286T2 (en)
ES (1) ES2155191T3 (en)
NO (1) NO980020L (en)
NZ (1) NZ311833A (en)
PT (1) PT836658E (en)
SE (1) SE504657C2 (en)
WO (1) WO1997002384A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070139948A1 (en) * 2005-11-18 2007-06-21 Federal-Mogul World Wide, Inc. Lamp Assembly Having a Socket Made From High Temperature Plastic
CN102357430A (en) * 2011-09-07 2012-02-22 安徽普源分离机械制造有限公司 Main shaft part of separator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007033644A1 (en) * 2007-07-19 2009-01-22 Katharina Diener Pitot tube jet pump has cartridge seal comprising seal mounting on pump casing and hub seal on rotor casing cap, cartridge seal having radial shaft sealing ring with sealing lip
CN105805314B (en) * 2014-12-29 2017-11-28 福建利树股份有限公司 Slurry line pressure screen(ing) machine seals

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3420373A (en) * 1966-04-01 1969-01-07 Allen Bruce Hunter Pulp screens
US3497060A (en) * 1968-02-22 1970-02-24 Voith Gmbh J M Separator for fiber suspension
US3547267A (en) * 1967-12-27 1970-12-15 Douglas G Sutherland Straining apparatus
US3759533A (en) * 1971-04-12 1973-09-18 W Neely Sealing means for rotating shaft
US4083504A (en) * 1975-05-12 1978-04-11 Entoleter, Inc. Rotary processing apparatus
US4198373A (en) * 1978-11-03 1980-04-15 The Ceramic Coating Company Low profile drive for agitator shaft of chemical reactor vessel
US4287055A (en) * 1978-07-11 1981-09-01 Firma Hermann Finckh Maschinenfabrik Gmbh & Co. Method of sorting fibre suspensions as well as a pressure sorter for performing the method
US4732396A (en) * 1985-10-08 1988-03-22 Great Lakes Chemical Corporation Apparatus and method for sealing a rotating shaft
EP0294832A2 (en) * 1987-06-11 1988-12-14 A. Ahlstrom Corporation Pulp screening apparatus
US5275421A (en) * 1991-03-22 1994-01-04 John Hornsby Mechanical seal stud torquing system
US5324048A (en) * 1991-10-10 1994-06-28 Aes Engineering Limited Mechanical seals
US5344164A (en) * 1991-10-10 1994-09-06 Aes Engineering Limited Mechanical seals
US5409350A (en) * 1993-10-29 1995-04-25 Caterpillar Inc. Water pump bearing and seal cartridge

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3420373A (en) * 1966-04-01 1969-01-07 Allen Bruce Hunter Pulp screens
US3547267A (en) * 1967-12-27 1970-12-15 Douglas G Sutherland Straining apparatus
US3497060A (en) * 1968-02-22 1970-02-24 Voith Gmbh J M Separator for fiber suspension
US3759533A (en) * 1971-04-12 1973-09-18 W Neely Sealing means for rotating shaft
US4083504A (en) * 1975-05-12 1978-04-11 Entoleter, Inc. Rotary processing apparatus
US4287055A (en) * 1978-07-11 1981-09-01 Firma Hermann Finckh Maschinenfabrik Gmbh & Co. Method of sorting fibre suspensions as well as a pressure sorter for performing the method
SE436431B (en) * 1978-07-11 1984-12-10 Finckh Maschf KIT FOR SILVERING FIBER SUSPENSIONS AND PRESSURE FOR IMPLEMENTATION OF THE KIT
US4198373A (en) * 1978-11-03 1980-04-15 The Ceramic Coating Company Low profile drive for agitator shaft of chemical reactor vessel
US4732396A (en) * 1985-10-08 1988-03-22 Great Lakes Chemical Corporation Apparatus and method for sealing a rotating shaft
EP0294832A2 (en) * 1987-06-11 1988-12-14 A. Ahlstrom Corporation Pulp screening apparatus
US5275421A (en) * 1991-03-22 1994-01-04 John Hornsby Mechanical seal stud torquing system
US5324048A (en) * 1991-10-10 1994-06-28 Aes Engineering Limited Mechanical seals
US5344164A (en) * 1991-10-10 1994-09-06 Aes Engineering Limited Mechanical seals
US5409350A (en) * 1993-10-29 1995-04-25 Caterpillar Inc. Water pump bearing and seal cartridge

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070139948A1 (en) * 2005-11-18 2007-06-21 Federal-Mogul World Wide, Inc. Lamp Assembly Having a Socket Made From High Temperature Plastic
CN102357430A (en) * 2011-09-07 2012-02-22 安徽普源分离机械制造有限公司 Main shaft part of separator

Also Published As

Publication number Publication date
SE504657C2 (en) 1997-03-24
NO980020D0 (en) 1998-01-02
NZ311833A (en) 1999-03-29
BR9609583A (en) 1999-02-23
SE9502400D0 (en) 1995-07-03
DE69612286D1 (en) 2001-05-03
EP0836658B1 (en) 2001-03-28
ES2155191T3 (en) 2001-05-01
PT836658E (en) 2001-07-31
NO980020L (en) 1998-01-02
CN1183818A (en) 1998-06-03
DE69612286T2 (en) 2001-07-05
EP0836658A1 (en) 1998-04-22
SE9502400L (en) 1997-01-04
JPH11508645A (en) 1999-07-27
WO1997002384A1 (en) 1997-01-23
ATE200121T1 (en) 2001-04-15
CA2220298A1 (en) 1997-01-23
AU6323196A (en) 1997-02-05
JP3787158B2 (en) 2006-06-21
AU691120B2 (en) 1998-05-07

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Legal Events

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AS Assignment

Owner name: SUNDS DEFIBRATOR INDUSTRIES AB, SWEDEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FORSLUND, KJELL;BERGDAHL, ANDERS;KRISTROM, KLAS;REEL/FRAME:009083/0084

Effective date: 19971013

AS Assignment

Owner name: VALMET FIBERTECH AKTIEBOLAG, SWEDEN

Free format text: CHANGE OF NAME;ASSIGNOR:SUNDS DEFIBRATOR INDUSTRIES AKTIEBOLAG;REEL/FRAME:010780/0273

Effective date: 19990902

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Year of fee payment: 4

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Year of fee payment: 8

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20120905